If the main contractor becomes insolvent, its sub-contractor will want to know if it can obtain payment from any other source, in particular from the employer. The sub-contractor's first step should always be to check whether the terms of its sub-contract provide any assistance in such a situation. In doing so, the sub-contractor should also check the terms of the main contract if, as is often the case, it has been incorporated into the sub-contract. If a copy of the main contract was not physically attached to the sub-contract at the time of execution, the terms of the sub-contract may entitle the sub-contractor to ask for a copy from the main contractor. This Q&A looks at the possible routes by which the sub-contractor may be able to obtain payment in these circumstances. Collateral warranty If the sub-contractor has provided a collateral warranty to the employer, it may contain 'step-in' rights which allow the employer, in certain circumstances, to take over the role of the main contractor